Bag closure



June 12,1934. .w. N. BAKER 1,962,117

BAG CLOSURE Filed Sept 25. 1931 2 sheets-sheet 1 'BY' ATTORNEY INVENTOR June 12, 1934, w, N, BAKER 1,962,117

' BAG CLOSURE Filed Sept. 25. 1931 2 Shets-Sheet 2 1 :51 551 ii, INVENTOR 7 m A r'roRNEY Patented June 12, 1934 I BAG CLOSURE Webster Noyes Baker, Glens Falls, N. Y., assignor,

by mesne assignments, to

Bagpak, Inc., New

York, N. Y., a corporation of Delaware Application September 25, 1931, Serial No. 565,019 12 Claims. (Cl. 229-62) This invention relates to an improved form of bag closure which is simple, inexpensive, easy to employ, and particularly effective. It may be utilized in the closing of open mouthed bags after they have been filled or the formation of the bottoms of bags of various sorts,whether open mouthed or valved.

- A feature of the invention is the folding of the end of a bag, which may be cut square across, without any special slitting or cutting, so as to include a sealing strip within the folds. The resulting construction is neat, strong, and completely sift proof.

Other features and advantages of the invention .15 will appear from a detailed description of an illustrative embodiment of the same which will now be given in conjunction with the accompanying drawings in which:. a

Figure 1 is a perspective view of the open end of a bag prior to folding the same.

Figure 2 is a perspective view of the end of the bag at an intermediate stage in the folding operation.

Figure 3 is a perspective view of the end of the bag at a later stage in the folding operation.

Figure 4 is a perspective view of the end of the bag as completed, and

Figure 5 is an enlarged transverse sectional view through the bag along the line 5-5 of Figure 4.

Referring now to the drawings the bag may comprise a tube 10 formed in the ordinary way with gussets 11 and 12 at its sides. The tube may conveniently be formed of a number of thicknesses of paper or similar material, as shown, although the invention is applicable to single wall bags as wellas multi-wali bags. In the folding of the bag end the gussets are first opened out as shown in Figure 2 and the side walls are then folded out-' wardly along the lines 13 and 14 between the points 15 which are preferably located along lines at to the upper corners 16 of the bag. For this purpose folding bars of suitable length may be placed along the lines 13 and 14 and brought to- 45 gether, pinching the the opposite walls of the tube between them, whilethe portions 17 above these bars may be bent outwardly at an angle of 90 as shown in Figure 2. This will serve .to pull the upper ends of the gussets 11 and 12 toward each other to a certain extent. Folds will be formed along the edges 18 extending from thepoints 15 to the upper-:c rners-IG. These folds may be accentuated by forcingthe triangular portions 19 against the gussets' which at the same time will form creases along 20. This may be done by suitably forcing folding bars into these crease lines to produce a substantially right angled relation between the portions 17 and 19.

A sealing strip 21 formed of any suitable. material, such as creped paper or other forms of 00 paper, cloth or similar flexible material, may now be placed over the portions 17- so that the bag will then assume the condition disclosedin Figure 2. The sealing strip should preferably extend completely across the bag between the crease lines 20 05 at the opposite gussets so as to completely conceal the joint 22 between the butted ends of the side wall althoughthe ends of the sealing strip may, if desired, terminate some distance from these crease lines as will be later explained. Paste may be employed to assist in retaining the strip 21. in position'although it is not essential as the strip will be held in place by other means, as will presently appear.

The upstanding portions 23 at the sides of the bag may now be folded over along the lines 20 into the position shown in Figure 3. If then the central creases 24 of the gussets are forced inwardly and the two sides of the bottom are folded down along the lines 25 the parts will assume the go positions shown in Figure 4. Any suitable fastening means such as staples 26 may be employed for securing the various portions of the bag in the positions shown. These staples may be arranged in any suitable way either-in a single or 35 a double row and either parallel with or at an angle to the end of the bag and will be passed through the portions 23 as well as the portions 17 and the sealing strip 21. They are preferably not passed through any portion of the gussets, however, since these would be apt to tear away from the fastening devices in the course of handling the bags when filled. In lieu of employing staples the bag may be sewn if desired .but in the construction of a relatively heavy, multi-wall bag the staple type of fastening will be found more satisfactory. It will be apparent that the portions 23 will serve to cover the ends of the joint 22 so that the sealing strip 21 need only extend a short distance beneath these portions. sifting will be more definitely prevented, however, if the sealing strip is extended acrossthe entire end of the bag as shown.

If the closure is applied to the open mouth of a bag which has already been filled the g'ussets 5 will remain more or less in the position shown in Figure 3, or they may even be forced outwardly to a greater'degree but the other portions will assume the same relations as indicated in Figure 4. Since the fastening devices pass through both 110 the walls of the bag and through the overturned portions 17 a strong construction is provided. No strain is transmitted to the sealing strip 21 although this strip should, of course, resist tearing from outside sources. It should accordingly be of relatively tough material.

While an illustrative form of the improved closure has been disclosed in considerable detail it will be understood that various changes may be made in the construction and formation of the various parts without departing from the general spirit and scope. of the invention as defined by the claims.

I claim:

1. A bag closure which comprises butted side walls folded outwardly at their ends, a sealing strip over the joint between said walls, flaps integral with said walls folded over said strip, and means for securing said strip and the ends of said walls together.

2. A bag comprising a tubular member having its end cut square and unbroken, the opposite walls of said member being butted and folded outwardly adajcent their ends, a sealing strip over the joint between the folds of the butted ends, a portion of said tube being folded over each end of said sealing strip, and means for securing said butted and folded ends of the walls.

3. A bag comprising a gusseted tubular member having its end cut square and unbroken, the opposite walls of said member being butted and folded outwardly adjacent their ends, a sealing strip over the joint between the folds of the butted ends, the ends of the gussets and the adjacent portions of the walls being folded over the ends of said sealing strip, and means for securing said, butted and folded ends of the walls.

4. A bag comprising a gusseted tubular member having its end cut square and unbroken, the opposite walls of said member being butted and folded outwardly adjacent their ends, a sealing strip over the joint between the folds of the butted ends, the ends of the gussets and the adjacent portions of the walls being folded over the ends of said sealing strip, and staples for securing said sealing strip, the butted ends of the walls and folded ends of the gussets.

1 5. A bag closure which comprises side walls having their ends butted and folded outwardly and back against said walls, extensions integral with the side walls folded over said folded ends and partially concealing the joint between them, and a sealing strip concealing the portion of said joint between said extensions.

6. A bag closure which comprises side walls having their ends butted and folded outwardly and back against said walls, extensions integral with the side walls folded over said folded ends, a sealing strip over the joint between said folded ends and retained between said extensions and said ends, and fastening devices for securing said extensions and said strip to said folded ends.

7. A bag closure which comprises side walls having their ends butted and folded outwardly and back against said walls, extensions integral with the side walls folded over said folded ends, a sealing strip pasted over the joint between said folded ends, and means for securing together the butted ends of said walls, said means also securing said extensions to said folded ends.

8. A method of closing the end of a bag which comprises folding the ends of the side walls outwardly at approximately 90, applying a sealing strip to the surface provided by the out-turned ends, folding integral extensions at the corners of the bag over said sealing strip, bending said ends with said extensions against said walls, and securing said ends and extensions to said walls.

9. A method of closing the end of a gusseted bag which comprises folding the ends of the side walls outwardly at approximately 90, applying a sealing strip to the surface provided by the outturned ends, folding the extending ends of the gussets over said strip, bending the ends of said walls and said gussets against said walls, and securing the free corners of said gussets and the end of said walls together.

10. A method of closing the end of a gusseted bag which comprises folding the ends of the side walls outwardly at approximately 90, applying a sealing strip to the surface provided by the outturned ends, folding the extending ends of the gussets over said strip, bending the ends of said walls and said gussets against said walls, and 115 stapling the folded ends of said gussets and said walls on opposite sides of the bag together.

11. A bag closure which comprises a sealing strip included within and retained by the folds at the end of the bag and means for securing the 120 folds and said strip in place.

12. A bag comprising a gusseted tubular member having a square cut, unbroken end folded to form a closure, a sealing strip included within and retained by the folds, and means for securing the 125 folds and said strip in place.

WEBSTER NOYES BAKER.

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